Date: Sat, 5 Feb 2005 15:33:48 -0500 From: Doug Van Allen <dvanallen@gmail.com> To: freebsd-questions@freebsd.org, Kevin Kinsey <kdk@daleco.biz> Subject: Re: Can't ssh to server Message-ID: <2063a95c0502051233a9495ee@mail.gmail.com> In-Reply-To: <42051E06.1050508@daleco.biz> References: <2063a95c05020509493b35ee0d@mail.gmail.com> <42051E06.1050508@daleco.biz>
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# Start by allowing everything (this prevents the rest of the file
# from working, so remove it when you need protection).
# The rules here work on a "First match wins" basis.
#ALL : ALL : allow
ALL : 192.168.1. : allow
ALL : 151.xxx.xxx.xxx-151.xxx.xxx.xxx : allow
ALL : 127.0.0.1 : allow
# Wrapping sshd(8) is not normally a good idea, but if you
# need to do it, here's how
#sshd : .evil.cracker.example.com : deny
# Protect against simple DNS spoofing attacks by checking that the
# forward and reverse records for the remote host match. If a mismatch
# occurs, access is denied, and any positive ident response within
# 20 seconds is logged. No protection is afforded against DNS poisoning,
# IP spoofing or more complicated attacks. Hosts with no reverse DNS
# pass this rule.
ALL : PARANOID : RFC931 20 : deny
# Allow anything from localhost. Note that an IP address (not a host
# name) *MUST* be specified for rpcbind(8).
ALL : localhost 127.0.0.1 [::1] : allow
ALL : 192.168.1.75 : allow
# To use IPv6 addresses you must enclose them in []'s
#ALL : [fe80::%fxp0]/10 : allow
#ALL : [fe80::]/10 : deny
#ALL : [2001:db8:2:1:2:3:4:3fe1] : deny
#ALL : [2001:db8:2:1::]/64 : allow
# Sendmail can help protect you against spammers and relay-rapers
sendmail : localhost : allow
sendmail : .nice.guy.example.com : allow
sendmail : .evil.cracker.example.com : deny
sendmail : ALL : allow
# Exim is an alternative to sendmail, available in the ports tree
exim : localhost : allow
exim : .nice.guy.example.com : allow
exim : .evil.cracker.example.com : deny
exim : ALL : allow
# Rpcbind is used for all RPC services; protect your NFS!
# (IP addresses rather than hostnames *MUST* be used here)
rpcbind : 192.0.2.32/255.255.255.224 : allow
rpcbind : 192.0.2.96/255.255.255.224 : allow
rpcbind : ALL : deny
# NIS master server. Only local nets should have access
ypserv : localhost : allow
ypserv : .unsafe.my.net.example.com : deny
ypserv : .my.net.example.com : allow
ypserv : ALL : deny
# Provide a small amount of protection for ftpd
ftpd : localhost : allow
ftpd : .nice.guy.example.com : allow
ftpd : .evil.cracker.example.com : deny
ftpd : ALL : allow
# You need to be clever with finger; do _not_ backfinger!! You can easily
# start a "finger war".
fingerd : ALL \
: spawn (echo Finger. | \
/usr/bin/mail -s "tcpd\: %u@%h[%a] fingered me!" root) & \
: deny
# The rest of the daemons are protected.
ALL : ALL \
: severity auth.info \
: twist /bin/echo "You are not welcome to use %d from %h."
On Sat, 05 Feb 2005 13:27:02 -0600, Kevin Kinsey <kdk@daleco.biz> wrote:
> Doug Van Allen wrote:
>
> >I'm running FreeBSD 5.3 and I'm trying to connect to it from school
> >using ssh. At school, I get connection refused. I checked the
> >auth.log and found:
> >
> >Feb 3 21:23:05 FreeBSD sshd[44237]: twist xxxxx.xxxx.edu to /bin/echo
> >"You are not welcome to use sshd from xxxxx.xxxx.edu."
> >
> >I ran tcpdmatch and got:
> >
> >$ tcpdmatch sshd bt20510.hvcc.edu
> >warning: sshd: no such process name in /etc/inetd.conf
> >client: hostname bt20510.hvcc.edu
> >client: address 151.103.21.131
> >server: process sshd
> >matched: /etc/hosts.allow line 91
> >option: severity auth.info
> >option: twist /bin/echo "You are not welcome to use sshd from
> >bt20510.hvcc.edu."
> >
> >I have made changes to hosts.allow to only allow my local network and
> >the ip's of the workstations from school. I am running PF and only
> >allowed the same rules. So what gives?
> >
> >
>
> Can you show the pertinent lines from /etc/hosts.allow?
>
> Kevin Kinsey
>
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